FilterCal

Filtering multiple or overloaded calendars is now simple. You can sort through all of your Family activities, work appointments and school commitments, and create a nice, neat, abbreviated schedule.
FilterCal's intuitive interface will help you to select the Events you simply must have, and then either Copy or Move them to a calendar of your choice.

You can then hide the source calendar(s) and instantly clean up your display. No more being bombarded with Calendar Items you don't need or want.